clean up and fix for dotnet-8 #372

Job	Run time
linux-arm (arm64)	31m 38s
linux-compat (al2-x64)	2m 58s
linux_mono	3m 3s
linux-compiler-compat (clang-3)	3m 9s
linux-compiler-compat (clang-6)	3m 4s
clang-sanitizers (,thread)	2m 54s
osx	2m 26s
linux-compiler-compat (clang-8)	3m 10s
clang-sanitizers (,address,undefined)	3m 3s
linux-compiler-compat (clang-9)	3m 12s
osx-arm64-cross-compile	2m 21s
linux-compiler-compat (clang-10)	3m 13s
linux-compiler-compat (clang-11)	3m 45s
windows-vc14 (x86)	5m 23s
linux-compiler-compat (gcc-4.8)	3m 53s
windows-vc16 (x64)	5m 39s
windows-vc14 (x64)	6m 23s
linux-compiler-compat (gcc-5)	3m 5s
linux-compiler-compat (gcc-6)	3m 49s
linux-compiler-compat (gcc-7)	3m 9s
check-submodules	39s
linux-compiler-compat (gcc-8)	3m 10s
	1h 43m 6s

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